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using System;
using System.Diagnostics;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
using MediaBrowser.Model.Diagnostics;
namespace Emby.Server.Implementations.Diagnostics
{
public class CommonProcess : IProcess
{
public event EventHandler Exited;
private readonly ProcessOptions _options;
private readonly Process _process;
public CommonProcess(ProcessOptions options)
{
_options = options;
var startInfo = new ProcessStartInfo
{
Arguments = options.Arguments,
FileName = options.FileName,
WorkingDirectory = options.WorkingDirectory,
UseShellExecute = options.UseShellExecute,
CreateNoWindow = options.CreateNoWindow,
RedirectStandardError = options.RedirectStandardError,
RedirectStandardInput = options.RedirectStandardInput,
RedirectStandardOutput = options.RedirectStandardOutput
};
startInfo.ErrorDialog = options.ErrorDialog;
if (options.IsHidden)
{
startInfo.WindowStyle = ProcessWindowStyle.Hidden;
}
_process = new Process
{
StartInfo = startInfo
};
if (options.EnableRaisingEvents)
{
_process.EnableRaisingEvents = true;
_process.Exited += _process_Exited;
}
}
private bool _hasExited;
private bool HasExited
{
get
{
if (_hasExited)
{
return true;
}
try
{
_hasExited = _process.HasExited;
}
catch (InvalidOperationException)
{
_hasExited = true;
}
return _hasExited;
}
}
private void _process_Exited(object sender, EventArgs e)
{
_hasExited = true;
if (Exited != null)
{
Exited(this, e);
}
}
public ProcessOptions StartInfo => _options;
public StreamWriter StandardInput => _process.StandardInput;
public StreamReader StandardError => _process.StandardError;
public StreamReader StandardOutput => _process.StandardOutput;
public int ExitCode => _process.ExitCode;
public void Start()
{
_process.Start();
}
public void Kill()
{
_process.Kill();
}
public bool WaitForExit(int timeMs)
{
return _process.WaitForExit(timeMs);
}
public Task<bool> WaitForExitAsync(int timeMs)
{
//Note: For this function to work correctly, the option EnableRisingEvents needs to be set to true.
if (HasExited)
{
return Task.FromResult(true);
}
timeMs = Math.Max(0, timeMs);
var tcs = new TaskCompletionSource<bool>();
var cancellationToken = new CancellationTokenSource(timeMs).Token;
_process.Exited += (sender, args) => tcs.TrySetResult(true);
cancellationToken.Register(() => tcs.TrySetResult(HasExited));
return tcs.Task;
}
public void Dispose()
{
_process.Dispose();
}
}
}
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